Theoretical Motivations and Empirical Evidence for Diquark Correlations in Hadrons

The past fifteen years have seen a remarkable evolution in our perception of hadron structure. Especially within the past five years, modern experimental facilities, new techniques for the continuum bound-state problem, and progress with lattice-regularized QCD have begun pointing to a crucial role for soft quark + quark (diquark) correlations in forming the structure of hadrons. For instance, theory indicates that diquark correlations within baryons are a necessary consequence of emergent hadron mass mechanisms; that the presence and character of diquark correlations make heavy impressions on helicity dependent baryon structure functions; experiments have uncovered signals for such correlations in the flavour-separation of the proton’s electromagnetic form factors and the appearance of zeroes therein; and the possibility that diquarks play a role in forming some of the XYZ states is hotly debated. Today’s key questions are: “If diquark correlations are real, then where should physics best look to find, understand, and exploit them?” This workshop will gather experimentalists, phenomenologists, and theorists to undertake a critical review of existing information, consolidate the facts, and therefrom develop a coherent, unified picture of hadron structure.